package top.hyperplasma.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import top.hyperplasma.constant.MessageConstant;
import top.hyperplasma.constant.StatusConstant;
import top.hyperplasma.dto.SetmealDTO;
import top.hyperplasma.dto.SetmealPageQueryDTO;
import top.hyperplasma.entity.Dish;
import top.hyperplasma.entity.Setmeal;
import top.hyperplasma.entity.SetmealDish;
import top.hyperplasma.exception.SetmealEnableFailedException;
import top.hyperplasma.mapper.DishMapper;
import top.hyperplasma.mapper.SetmealDishMapper;
import top.hyperplasma.mapper.SetmealMapper;
import top.hyperplasma.result.PageResult;
import top.hyperplasma.service.SetmealService;
import top.hyperplasma.vo.DishItemVO;
import top.hyperplasma.vo.SetmealVO;

import java.util.List;

@Service
@Slf4j
public class SetmealServiceImpl implements SetmealService {

    @Autowired
    private SetmealMapper setmealMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private DishMapper dishMapper;


    /**
     * 新增套餐，同时保存套餐与菜品的关联关系
     *
     * @param setmealDTO
     */
    @Transactional
    public void saveWithDish(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);

        // 向套餐表插入数据
        setmealMapper.insert(setmeal);

        // 获取生成的套餐id
        Long setmealId = setmeal.getId();
        // 遍历，设置套餐id
        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> setmealDish.setSetmealId(setmealId));

        // 保存套餐与菜品的关联关系
        setmealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 套餐分页查询
     *
     * @param setmealPageQueryDTO
     * @return PageResult
     */
    public PageResult pageQuery(SetmealPageQueryDTO setmealPageQueryDTO) {
        int pageNum = setmealPageQueryDTO.getPage();
        int pageSize = setmealPageQueryDTO.getPageSize();

        PageHelper.startPage(pageNum, pageSize);
        Page<SetmealVO> page = setmealMapper.pageQuery(setmealPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 套餐批量删除
     *
     * @param ids
     */
    public void deleteBatch(List<Long> ids) {
        ids.forEach(setmealId -> {
            Setmeal setmeal = setmealMapper.getById(setmealId);
            if (setmeal.getStatus().equals(StatusConstant.ENABLE)) {
                // 起售中的套餐不能删除
                throw new RuntimeException(MessageConstant.SETMEAL_ON_SALE);
            }
        });

        ids.forEach(setmealId -> {
            // 删除套餐表中的数据
            setmealMapper.deleteById(setmealId);

            // 删除套餐菜品关系表中的数据
            setmealDishMapper.deleteBySetmealId(setmealId);
        });
    }

    /**
     * 根据id查询套餐和套餐菜品关联信息
     *
     * @param id
     * @return
     */
    public SetmealVO getByIdWithDish(Long id) {
        Setmeal setmeal = setmealMapper.getById(id);
        List<SetmealDish> setmealDishes = setmealDishMapper.getBySetmealId(id);

        SetmealVO setmealVO = new SetmealVO();
        BeanUtils.copyProperties(setmeal, setmealVO);
        setmealVO.setSetmealDishes(setmealDishes);
        return setmealVO;
    }

    /**
     * 修改套餐
     *
     * @param setmealDTO
     */
    @Transactional
    public void update(SetmealDTO setmealDTO) {
        Setmeal setmeal = new Setmeal();
        BeanUtils.copyProperties(setmealDTO, setmeal);

        // 1、修改套餐表，执行update
        setmealMapper.update(setmeal);

        // 2、删除套餐和菜品的关联关系：操作setmeal_dish表，执行delete
        Long setmealId = setmealDTO.getId();
        setmealDishMapper.deleteBySetmealId(setmealId);

        List<SetmealDish> setmealDishes = setmealDTO.getSetmealDishes();
        setmealDishes.forEach(setmealDish -> setmealDish.setSetmealId(setmealId));

        // 3、重新插入套餐和菜品的关联关系：操作setmeal_dish表，执行insert
        setmealDishMapper.insertBatch(setmealDishes);
    }

    /**
     * 套餐起售/停售
     *
     * @param status
     * @param id
     */
    public void startOrStop(Integer status, Long id) {
        // 起售套餐时，判断套餐内是否有停售菜品，有停售菜品则发出提示
        if (status.equals(StatusConstant.ENABLE)) {
            List<Dish> dishList = dishMapper.getBySetmealId(id);
            if (dishList != null && !dishList.isEmpty()) {
                dishList.forEach(dish -> {
                    if (StatusConstant.DISABLE.equals(dish.getStatus())) {
                        throw new SetmealEnableFailedException(MessageConstant.SETMEAL_ENABLE_FAILED);
                    }
                });
            }
        }

        Setmeal setmeal = Setmeal.builder()
                .id(id)
                .status(status)
                .build();
        setmealMapper.update(setmeal);
    }

    /**
     * 条件查询
     *
     * @param setmeal
     * @return
     */
    public List<Setmeal> list(Setmeal setmeal) {
        List<Setmeal> list = setmealMapper.list(setmeal);
        return list;
    }

    /**
     * 根据套餐id查询菜品选项
     *
     * @param id
     * @return
     */
    public List<DishItemVO> getDishItemById(Long id) {
        return setmealMapper.getDishItemBySetmealId(id);
    }
}
